EP2545201B1 - Helical compression spring for an oil ring of a piston in a motor and method therefor - Google Patents

Helical compression spring for an oil ring of a piston in a motor and method therefor Download PDF

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Publication number
EP2545201B1
EP2545201B1 EP11703904.0A EP11703904A EP2545201B1 EP 2545201 B1 EP2545201 B1 EP 2545201B1 EP 11703904 A EP11703904 A EP 11703904A EP 2545201 B1 EP2545201 B1 EP 2545201B1
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EP
European Patent Office
Prior art keywords
compression spring
layer
helical compression
coating
metal
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EP11703904.0A
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German (de)
French (fr)
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EP2545201A1 (en
Inventor
Marcus Kennedy
Hans-Rainer Brillert
Michael Zinnabold
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Federal Mogul Burscheid GmbH
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Federal Mogul Burscheid GmbH
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J9/00—Piston-rings, e.g. non-metallic piston-rings, seats therefor; Ring sealings of similar construction
    • F16J9/06—Piston-rings, e.g. non-metallic piston-rings, seats therefor; Ring sealings of similar construction using separate springs or elastic elements expanding the rings; Springs therefor ; Expansion by wedging
    • F16J9/061—Piston-rings, e.g. non-metallic piston-rings, seats therefor; Ring sealings of similar construction using separate springs or elastic elements expanding the rings; Springs therefor ; Expansion by wedging using metallic coiled or blade springs
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C30/00—Coating with metallic material characterised only by the composition of the metallic material, i.e. not characterised by the coating process
    • C23C30/005—Coating with metallic material characterised only by the composition of the metallic material, i.e. not characterised by the coating process on hard metal substrates
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
    • C23C28/04—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings of inorganic non-metallic material
    • C23C28/044—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings of inorganic non-metallic material coatings specially adapted for cutting tools or wear applications
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
    • C23C28/04—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings of inorganic non-metallic material
    • C23C28/046—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings of inorganic non-metallic material with at least one amorphous inorganic material layer, e.g. DLC, a-C:H, a-C:Me, the layer being doped or not
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
    • C23C28/40—Coatings including alternating layers following a pattern, a periodic or defined repetition
    • C23C28/42—Coatings including alternating layers following a pattern, a periodic or defined repetition characterized by the composition of the alternating layers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J9/00—Piston-rings, e.g. non-metallic piston-rings, seats therefor; Ring sealings of similar construction
    • F16J9/26—Piston-rings, e.g. non-metallic piston-rings, seats therefor; Ring sealings of similar construction characterised by the use of particular materials

Definitions

  • the invention relates to a helical compression spring which is provided as part of a two-piece ⁇ labstreifrings in a piston of an internal combustion engine, the second component of such a oil control ring, namely to press the so-called main body in sliding contact with a cylinder or a cylinder liner against the cylinder wall. Furthermore, the present invention relates to a method for coating such a helical compression spring.
  • the EP 1 717 493 A1 discloses a helical compression spring for a ⁇ labstreifkolbenring, which is at least partially provided with an amorphous, wear-resistant graphite layer.
  • the WO2009 / 121719 A2 relates to a piston ring with a metal-containing, amorphous carbon layer and a metal-free, amorphous carbon layer.
  • the invention has for its object to provide a helical compression spring and a method for its coating, with which the friction and / or wear and / or run-in behavior of at least one component of a two-piece oil control ring is improved.
  • the solution to this problem is done firstly by the helical compression spring described in claim 1.
  • the coating provided is characterized by several alternating layers of CrN and aC: H: Me layers.
  • H Me layers.
  • Me stands for metal and, for example, tungsten, chromium, titanium, germanium or silicon can be used for this purpose.
  • aC: H: Me and the aC: H layer mentioned below are DLC layers and provide comparatively low wear and good friction properties.
  • the usually higher resistance to wear of the CrN layer compared to DLC can advantageously take effect from the beginning or when the outermost DLC layer has worn out.
  • the described multilayer coating also offers the advantage that significantly higher overall layer thicknesses can be realized than with conventional DLC layer systems. This is mainly due to the fact that the higher residual stresses in DLC compared to CrN can be compensated by the CrN layers within the coating as a whole.
  • the helical compression spring is preferably made of steel, in particular CrSi or CrNi steel, wound substantially helically and accordingly has two spring ends, which meet due to the largely circular arrangement of the spring in the installation or operating state without a gap. This point is preferably radially opposite the joint of the piston ring.
  • the coating according to the invention for example, in the DE 10 2005 019 500 B4 described helical compression spring can be applied instead of the hydrogen-free iC graphite layers described therein.
  • all the individual features of the helical compression spring described therein are made subject to the present application by the reference made herein.
  • the ⁇ labstreifkolbenring may be performed circumferentially not closed, but a so-called shock, in other words have a gap in the circumferential direction.
  • the helical compression spring is formed continuously in this area and is preferably in the region of the shock and symmetrical with this coated at a circumferential angle of 5 ° to 60 °.
  • the above-described angle about the stroke of the piston ring is designated ⁇ .
  • the piston ring has a preferably approximately in cross-section approximately semicircular shaped groove for receiving the helical compression spring.
  • this is preferably coated on the side facing the piston ring at an angle ( ⁇ according to the document referred to) of 5 ° to 180 °, preferably symmetrically to the median plane.
  • piston ring described therein in one of the specified embodiments can be combined in an advantageous manner with the helical compression spring described herein, and this combination is to be regarded as the subject of the present application. Furthermore, on the piston ring that coating, in particular on the inner surface, applicable, which is described in the filed on the same day by the same applicant application "method for coating at least the inner surface of a piston ring and piston ring".
  • the helical compression spring preferably made of steel
  • This can in particular be vapor-deposited and has preferred a layer thickness of less than 0.5 microns. 0.01 ⁇ m is currently preferred as the minimum layer thickness of the adhesive layer.
  • a metal-free DLC layer in other words a layer of the type a-C: H is preferred.
  • a layer of the type a-C: H ensures the best possible run-in behavior.
  • 0.1 to 5.0 microns have proven to be advantageous.
  • the minimum layer thickness of 0.1 ⁇ m is advantageous for a good run-in behavior.
  • the maximum layer thickness is due to the minimum bond strength, which is lower for thicker layers.
  • application to both a CrN and an a-C: H: Me layer is conceivable.
  • H Me layer 30 nm to 100 nm are used.
  • a thickness of more than 30 nm offers the advantage that, when used in series, the testability of the layer structure is ensured.
  • the total thickness of the coating is advantageously, in order to ensure good friction behavior with a good life, 0.5 to 10 microns.
  • the number of individual layers is between 10 and 200.
  • DLC layer in particular the set metal-containing and / or metal-free DLC layer, if it contains hydrogen.
  • the coating described can be produced in the context of the method according to the invention by a combination of PVD and PA-CVD method.
  • the figure shows a layer structure according to the invention.
  • a chromium adhesive layer 12 is first applied to the base material 10 of the sliding element.
  • a plurality of ⁇ -C: H: Me layers 14 and CrN layers 16 are alternately applied from the inside to the outside.
  • the outermost layer is formed by an a-C: H layer. In the example shown, this is applied to a DLC layer, but it can also be applied to an a-C: H: Me layer.
  • the preparation is preferably carried out in such a way that the CrN layers are produced by means of PVD, the ⁇ -C: H: Me layer by means of PVD and PA-CVD, and the ⁇ -C: H layer by means of PA-CVD.

Description

Gebiet der ErfindungField of the invention

Die Erfindung betrifft eine Schraubendruckfeder, die als Bestandteil eines zweiteiligen Ölabstreifrings in einem Kolben eines Verbrennungsmotors dafür vorgesehen ist, den zweiten Bestandteil eines derartigen Ölabstreifrings, nämlich den in Gleitkontakt mit einem Zylinder oder einer Zylinderlaufbuchse stehenden sogenannten Grundkörper gegen die Zylinderwand zu drücken. Ferner betrifft die vorliegende Erfindung ein Verfahren zur Beschichtung einer derartigen Schraubendruckfeder.The invention relates to a helical compression spring which is provided as part of a two-piece Ölabstreifrings in a piston of an internal combustion engine, the second component of such a oil control ring, namely to press the so-called main body in sliding contact with a cylinder or a cylinder liner against the cylinder wall. Furthermore, the present invention relates to a method for coating such a helical compression spring.

Wie erwähnt, befindet sich bei dem beschriebenen zweiteiligen Ölabstreifring die Schraubendruckfeder an der Innenseite der Anordnung, mit anderen Worten zwischen dem in Gleitkontakt mit der Zylinderwand stehenden Grundkörper des Kolbenrings und dem Boden der Kolbenringnut. Hier kommt es durch die dynamische Beanspruchung während des Betriebs des Motors zu Relativbewegungen zwischen dem Grundkörper und der Schraubendruckfeder. Diese Bewegung kann zu sogenanntem Sekundärverschleiß führen, der sich im Grundkörper in Form von Nuteingrabungen, und an der Feder in Form von Materialabtrag zeigen kann. In den Nuteingrabungen kann sich die Feder verhaken, was die Abstreifwirkung des Ölringes beeinträchtigt. Ferner kann es zu einem Nachlassen der zur Erfüllung der Funktion erforderlichen Tangentialkraft kommen.As mentioned, in the described two-piece Ölabstreifring the helical compression spring on the inside of the assembly, in other words between the standing in sliding contact with the cylinder wall body of the piston ring and the bottom of the piston ring groove. Here, it comes through the dynamic stress during operation of the motor relative movements between the body and the helical compression spring. This movement can lead to so-called secondary wear, which can show in the body in the form of Nuteingrabungen, and on the spring in the form of material removal. In the Nuteingrabungen the spring can get caught, which affects the wiping action of the oil ring. Furthermore, the tangential force required to fulfill the function may decrease.

Stand der TechnikState of the art

Aus der DE 10 2005 019 500 B4 geht eine Schraubendruckfeder hervor, die mit wasserstofffreien iC-Graphitschichten beschichtet ist.From the DE 10 2005 019 500 B4 is a helical compression spring, which is coated with hydrogen-free iC graphite layers.

Die EP 1 717 493 A1 offenbart eine Schraubendruckfeder für einen Ölabstreifkolbenring, welche zumindest partiell mit einer amorphen, verschleißfesten Graphitschicht versehen ist.The EP 1 717 493 A1 discloses a helical compression spring for a Ölabstreifkolbenring, which is at least partially provided with an amorphous, wear-resistant graphite layer.

Die WO2009/121719 A2 betrifft einen Kolbenring mit einer metallhaltigen, amorphen Kohlenstoffschicht und einer metallfreien, amorphen Kohlenstoffschicht.The WO2009 / 121719 A2 relates to a piston ring with a metal-containing, amorphous carbon layer and a metal-free, amorphous carbon layer.

Darstellung der ErfindungPresentation of the invention

Der Erfindung liegt die Aufgabe zugrunde, eine Schraubendruckfeder und ein Verfahren zu dessen Beschichtung zu schaffen, mit denen das Reib- und/oder Verschleiß- und/oder Einlaufverhalten zumindest einer Komponente eines zweiteiligen Ölabstreifrings verbessert wird.The invention has for its object to provide a helical compression spring and a method for its coating, with which the friction and / or wear and / or run-in behavior of at least one component of a two-piece oil control ring is improved.

Die Lösung dieser Aufgabe erfolgt zum einen durch die im Anspruch 1 beschriebene Schraubendruckfeder. Die daran vorgesehene Beschichtung zeichnet sich durch mehrere alternierende Lagen von CrN- und a-C:H:Me-Schichten aus. Bei ersten Versuchen hat sich herausgestellt, dass durch einen derartigen Schichtaufbau sowohl die Lebensdauer als auch der relative Reibwert verbessert werden kann. Die Lebensdauer wird insbesondere durch eine Verbesserung der Schichtstabilität verlängert. Ferner konnte bei ersten Versuchen ein verbessertes Einlaufverhalten zwischen der Feder und dem Kolbenring festgestellt werden.The solution to this problem is done firstly by the helical compression spring described in claim 1. The coating provided is characterized by several alternating layers of CrN and aC: H: Me layers. In the first experiments, it has been found that such a layer structure can improve both the service life and the relative coefficient of friction. The service life is prolonged in particular by an improvement in the layer stability. Furthermore, an improved run-in behavior between the spring and the piston ring could be determined in first attempts.

Der guten Ordnung halber sei erwähnt, dass Me für Metall steht und hierfür beispielsweise Wolfram, Chrom, Titan, Germanium oder Silizium verwendet werden können. Sowohl die a-C:H:Me als auch die nachfolgend erwähnte a-C:H-Schicht sind DLC-Schichten und sorgen für einen vergleichsweisen geringen Verschleiß und gute Reibungseigenschaften. Insbesondere wird davon ausgegangen, dass, verursacht durch unterschiedliche radiale Anpressdrücke und dadurch erzeugte unterschiedliche Verschleißraten, beispielsweise über den Umfang einer Schraubendruckfeder, dennoch auf der Oberfläche immer zumindest teilweise DLC vorhanden ist, so dass die guten Reibeigenschaften, insbesondere auch unter Mangelschmierbedingungen, erhalten bleiben. Dies wird in vorteilhafter Weise kombiniert mit Vorteilen, welche die CrN-Schicht im Hinblick auf den Verschleiß bietet. Der gegenüber DLC üblicherweise höhere Verschleißwiderstand der CrN-Schicht kann in vorteilhafter Weise von Anfang an, bzw. wenn die äußerste DLC-Schicht verschlissen ist, wirksam werden. Die beschriebene, mehrlagige Beschichtung bietet darüber hinaus den Vorteil, dass deutlich höhere Gesamtschichtdicken als bei herkömmlichen DLC-Schichtsystemen realisiert werden können. Dies beruht im Wesentlichen darauf, dass die bei DLC gegenüber CrN höheren Eigenspannungen durch die CrN-Lagen innerhalb der Beschichtung insgesamt ausgeglichen werden können.For the sake of good order, it should be mentioned that Me stands for metal and, for example, tungsten, chromium, titanium, germanium or silicon can be used for this purpose. Both the aC: H: Me and the aC: H layer mentioned below are DLC layers and provide comparatively low wear and good friction properties. In particular, it is assumed that, caused by different radial contact pressures and thus generated different wear rates, for example over the circumference of a Helical compression spring, but always on the surface always at least partially DLC is present, so that the good friction properties, especially under deficient lubrication conditions, remain intact. This is advantageously combined with advantages offered by the CrN layer in terms of wear. The usually higher resistance to wear of the CrN layer compared to DLC can advantageously take effect from the beginning or when the outermost DLC layer has worn out. The described multilayer coating also offers the advantage that significantly higher overall layer thicknesses can be realized than with conventional DLC layer systems. This is mainly due to the fact that the higher residual stresses in DLC compared to CrN can be compensated by the CrN layers within the coating as a whole.

Die Schraubendruckfeder ist bevorzugt aus Stahl, insbesondere CrSi- oder CrNi-Stahl, im Wesentlichen spiralförmig gewickelt und weist dementsprechend zwei Federenden auf, die sich aufgrund der weitgehend kreisrunden Anordnung der Feder im Einbau- bzw. Betriebszustand ohne einen Zwischenraum treffen. Diese Stelle ist bevorzugt radial dem Stoß des Kolbenrings gegenüberliegend. Es sei erwähnt, dass die erfindungsgemäße Beschichtung beispielsweise auf die in der DE 10 2005 019 500 B4 beschriebene Schraubendruckfeder anstelle der dort beschriebenen wasserstofffreien iC-Graphitschichten aufgebracht werden kann. Insbesondere werden sämtliche Einzelmerkmale der dort beschriebenen Schraubendruckfeder durch die hierin erfolgte Bezugnahme zum Gegenstand der vorliegenden Anmeldung gemacht. Wie in dem in Bezug genommenen Dokument beschrieben, kann der Ölabstreifkolbenring umfänglich nicht geschlossen ausgeführt sein, sondern einen sogenannten Stoß, mit anderen Worten eine Lücke in Umfangsrichtung aufweisen. Die Schraubendruckfeder ist in diesem Bereich fortlaufend ausgebildet und ist bevorzugt im Bereich des Stoßes und symmetrisch zu diesem mit einem Umfangswinkel von 5° bis 60° beschichtet. In der in Bezug genommenen Veröffentlichung ist der vorangehend beschriebene Winkel um den Stoß des Kolbenrings mit α bezeichnet. An der Innenseite weist der Kolbenring eine bevorzugt im Querschnitt etwa halbkreisförmig geformte Nut zur Aufnahme der Schraubendruckfeder auf. In Achsrichtung der Schraubendruckfeder betrachtet ist diese bevorzugt auf der dem Kolbenring zugewandten Seite mit einem Winkel (β gemäß dem in Bezug genommenen Dokument) von 5° bis 180°, bevorzugt symmetrisch zur Mittelebene, beschichtet. Es sei ferner erwähnt, dass von der Anmelderin am gleichen Tag eine Anmeldung mit dem Titel "Gleitelement, insbesondere Kolbenring, und Verfahren zur Beschichtung eines Gleitelements" eingereicht wurde, in der eine ähnliche Beschichtung wie hierin beschrieben für ein Gleitelement, insbesondere einen Kolbenring angegeben ist. Sämtliche Merkmale der dort angegebenen Beschichtung sind auch auf die hierin beschriebene Beschichtung anwendbar. Ferner ist der dort beschriebene Kolbenring in einer der angegebenen Ausführungsformen in vorteilhafter Weise mit der hierin beschriebenen Schraubendruckfeder kombinierbar, und diese Kombination ist als Gegenstand der vorliegenden Anmeldung anzusehen. Ferner ist auf den Kolbenring diejenige Beschichtung, insbesondere an der Innenfläche, anwendbar, die in der von der Anmelderin ebenfalls am gleichen Tag eingereichten Anmeldung "Verfahren zur Beschichtung zumindest der Innenfläche eines Kolbenrings sowie Kolbenring" beschrieben ist.The helical compression spring is preferably made of steel, in particular CrSi or CrNi steel, wound substantially helically and accordingly has two spring ends, which meet due to the largely circular arrangement of the spring in the installation or operating state without a gap. This point is preferably radially opposite the joint of the piston ring. It should be noted that the coating according to the invention, for example, in the DE 10 2005 019 500 B4 described helical compression spring can be applied instead of the hydrogen-free iC graphite layers described therein. In particular, all the individual features of the helical compression spring described therein are made subject to the present application by the reference made herein. As described in the referenced document, the Ölabstreifkolbenring may be performed circumferentially not closed, but a so-called shock, in other words have a gap in the circumferential direction. The helical compression spring is formed continuously in this area and is preferably in the region of the shock and symmetrical with this coated at a circumferential angle of 5 ° to 60 °. In the referenced publication, the above-described angle about the stroke of the piston ring is designated α. On the inside, the piston ring has a preferably approximately in cross-section approximately semicircular shaped groove for receiving the helical compression spring. Viewed in the axial direction of the helical compression spring, this is preferably coated on the side facing the piston ring at an angle (β according to the document referred to) of 5 ° to 180 °, preferably symmetrically to the median plane. It should also be mentioned that the same application filed on behalf of the same applicant an application entitled "Sliding element, in particular piston ring, and method for coating a sliding element" in which a similar coating as described herein for a sliding element, in particular a piston ring , All features of the coating specified therein are also applicable to the coating described herein. Furthermore, the piston ring described therein in one of the specified embodiments can be combined in an advantageous manner with the helical compression spring described herein, and this combination is to be regarded as the subject of the present application. Furthermore, on the piston ring that coating, in particular on the inner surface, applicable, which is described in the filed on the same day by the same applicant application "method for coating at least the inner surface of a piston ring and piston ring".

Bevorzugte Weiterbildungen sind in den weiteren Ansprüchen beschrieben.Preferred developments are described in the further claims.

Für die Haftung der CrN-Schicht auf dem Substrat, also der Schraubendruckfeder, vorzugsweise aus Stahl, hat es sich als vorteilhaft erwiesen, eine Haftschicht aus Chrom auszubilden. Diese kann insbesondere aufgedampft sein und weist bevorzugt eine Schichtdicke von weniger als 0,5 µm auf. Als minimale Schichtdicke der Haftschicht wird derzeit 0,01 µm bevorzugt.For the adhesion of the CrN layer on the substrate, so the helical compression spring, preferably made of steel, it has proved to be advantageous to form an adhesive layer of chromium. This can in particular be vapor-deposited and has preferred a layer thickness of less than 0.5 microns. 0.01 μm is currently preferred as the minimum layer thickness of the adhesive layer.

Für die äußerste Schicht der erfindungsgemäßenFor the outermost layer of the invention

Schraubendruckfeder, die sich zunächst in Berührung mit dem Kolbenring befindet, wird eine metallfreie DLC-Schicht, mit anderen Worten eine Schicht des Typs a-C:H bevorzugt. Eine derartige Schicht gewährleistet ein bestmögliches Einlaufverhalten. Als Dicke dieser Schicht haben sich 0,1 bis 5,0 µm als vorteilhaft erwiesen. Die Mindestschichtdicke von 0,1 µm ist für ein gutes Einlaufverhalten vorteilhaft. Die maximale Schichtdicke ergibt sich aufgrund der Mindesthaftfestigkeit, die bei dickeren Schichten geringer wird. Für die beschriebene äußerste oder Top-Schicht ist das Auftragen sowohl auf eine CrN - als auch eine a-C:H:Me-Schicht denkbar.Helical compression spring, which is initially in contact with the piston ring, a metal-free DLC layer, in other words a layer of the type a-C: H is preferred. Such a layer ensures the best possible run-in behavior. As the thickness of this layer, 0.1 to 5.0 microns have proven to be advantageous. The minimum layer thickness of 0.1 μm is advantageous for a good run-in behavior. The maximum layer thickness is due to the minimum bond strength, which is lower for thicker layers. For the outermost or top layer described, application to both a CrN and an a-C: H: Me layer is conceivable.

Für die Einzellagen der CrN- und a-C:H:Me-Schicht werden 30 nm bis 100 nm verwendet. Eine Dicke von mehr als 30 nm bietet den Vorteil, dass bei der Anwendung in der Serie die Prüffähigkeit des Schichtaufbaus gewährleistet wird.For the individual layers of the CrN and a-C: H: Me layer 30 nm to 100 nm are used. A thickness of more than 30 nm offers the advantage that, when used in series, the testability of the layer structure is ensured.

Die Gesamtdicke der Beschichtung beträgt in vorteilhafter Weise, um mit einer guten Lebensdauer ein gutes Reibverhalten zu gewährleisten, 0,5 bis 10 µm. Die Anzahl der Einzellagen liegt zwischen 10 und 200.The total thickness of the coating is advantageously, in order to ensure good friction behavior with a good life, 0.5 to 10 microns. The number of individual layers is between 10 and 200.

Für die Härte der CrN-Schicht haben sich Werte von 800-1900 HV 0,002 bewährt. Diese Ausbildung kann mit einer Härte der metallfreien der DLC-Schicht von 1700-2900 HV 0,002 und/oder einer Härte der metallhaltigen DLC-Schicht von 800-1600 HV 0,002 kombiniert werden.Values of 800-1900 HV 0.002 have been proven for the hardness of the CrN layer. This design can be combined with a hardness of the metal-free DLC layer of 1700-2900 HV 0.002 and / or a hardness of the metal-containing DLC layer of 800-1600 HV 0.002.

Es wird ferner erwartet, dass sich besonders gute Eigenschaften der DLC-Schicht, insbesondere der metallhaltigen und/oder metallfreien DLC-Schicht einstellen, wenn diese Wasserstoff enthält.It is also expected that particularly good properties of the DLC layer, in particular the set metal-containing and / or metal-free DLC layer, if it contains hydrogen.

Die metallhaltige DLC-Schicht kann ferner in vorteilhafter Weise nanokristalline Metall- oderThe metal-containing DLC layer may also advantageously nanocrystalline metal or

Metallkarbidausscheidungen, wie z. B. WC, CrC, SiC, GeC oder TiC enthalten. Die Lösung der oben genannten Aufgabe erfolgt ferner durch das im Anspruch 8 beschriebene Verfahren.Metallkarbidausscheidungen, such as. As WC, CrC, SiC, GeC or TiC included. The solution of the above object is further achieved by the method described in claim 8.

In vorteilhafter Weise kann die beschriebene Beschichtung im Rahmen des erfindungsgemäßen Verfahrens durch eine Kombination aus PVD und PA-CVD-Verfahren hergestellt werden.Advantageously, the coating described can be produced in the context of the method according to the invention by a combination of PVD and PA-CVD method.

Es wird ferner eine Kombination zumindest einer vorangehend beschriebenen Schraubendruckfeder mit einem Kolbenring offenbart, der insbesondere die in der oben erwähnten parallel eingereichten Anmeldung beschriebene Beschichtung aufweisen kann. Ferner wird die Kombination des in dieser Weise entstehenden zweiteiligen Ölabstreifrings mit einem Laufpartner, insbesondere einem Zylinder oder einer Zylinderlaufbuchse eines Verbrennungsmotors, insbesondere eines Diesel- oder hoch aufgeladenen Otto-Motors, wobei der Laufpartner eisen- oder aluminiumbasiert ist, offenbart.There is further disclosed a combination of at least one previously described helical compression spring with a piston ring, which may in particular have the coating described in the above-mentioned application filed in parallel. Furthermore, the combination of the resulting in this way two-piece Ölabstreifrings with a running partner, in particular a cylinder or a cylinder liner of an internal combustion engine, in particular a diesel or highly supercharged gasoline engine, the running partner is iron or aluminum based disclosed.

Kurze Beschreibung der ZeichnungenBrief description of the drawings

Nachfolgend wird ein bevorzugtes Ausführungsbeispiel der Erfindung unter Bezugnahme auf die Zeichnungen näher erläutert.Hereinafter, a preferred embodiment of the invention will be explained in more detail with reference to the drawings.

Die Figur zeigt einen erfindungsgemäßen Schichtaufbau.The figure shows a layer structure according to the invention.

Ausführliche Beschreibung eines bevorzugtenDetailed description of a preferred Ausführungsbeispiels der ErfindungEmbodiment of the invention

Wie aus der Figur hervorgeht, ist auf dem Grundwerkstoff 10 des Gleitelements zunächst eine Chrom-Haftschicht 12 aufgebracht. Darauf sind von innen nach außen alternierend mehrere a-C:H:Me-Schichten 14 und CrN-Schichten 16 aufgebracht. Die äußerste Schicht wird durch eine a-C:H-Schicht gebildet. Bei dem gezeigten Beispiel ist diese auf einer DLC-Schicht aufgebracht, sie kann jedoch ebenso auf einer a-C:H:Me-Schicht aufgetragen werden.As can be seen from the figure, a chromium adhesive layer 12 is first applied to the base material 10 of the sliding element. Thereupon, a plurality of α-C: H: Me layers 14 and CrN layers 16 are alternately applied from the inside to the outside. The outermost layer is formed by an a-C: H layer. In the example shown, this is applied to a DLC layer, but it can also be applied to an a-C: H: Me layer.

Die Herstellung erfolgt bevorzugt derart, dass die CrN-Schichten mittels PVD, die a-C:H:Me-Schicht mittels PVD und PA-CVD, und die a-C:H-Schicht mittels PA-CVD hergestellt werden.The preparation is preferably carried out in such a way that the CrN layers are produced by means of PVD, the α-C: H: Me layer by means of PVD and PA-CVD, and the α-C: H layer by means of PA-CVD.

Claims (6)

  1. Helical compression spring for a piston ring, preferably made of steel, in particular CrSi or CrNi steel, having a coating which has several layers of CrN (16) and a-C:H:Me layers (14) alternately, wherein the number of layers is between 10 and 200 and the CrN and a-C:H:Me individual layers have a thickness of 30 nm to 100 nm each.
  2. Helical compression spring according to claim 1, characterised in that a bonding layer of chromium (12) which is preferably 0.01 to 0.5 µm thick is applied to a substrate (10) of the helical compression spring.
  3. Helical compression spring according to any of the preceding claims, characterised in that the outermost layer of the coating is an a-C:H layer (18) preferably having a thickness from 0.1 to 5.0 µm.
  4. Helical compression spring according to any of the preceding claims, characterised in that the coating has a thickness from 0.5 to 10 µm overall.
  5. Helical compression spring according to any of the preceding claims, characterised in that the hardness of the CrN layer is 800-1900 HV 0.002 and/or the hardness of the metal-free DLC layer is 1700-2900 HV 0.002 and/or the hardness of the metal-containing DLC layer is 800-1600 HV 0.002.
  6. Helical compression spring according to any of the preceding claims, characterised in that at least one metal-containing and/or metal-free DLC layer is made by PVD and/or PA-CVD methods.
EP11703904.0A 2010-03-09 2011-02-17 Helical compression spring for an oil ring of a piston in a motor and method therefor Not-in-force EP2545201B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102010002688.3A DE102010002688C5 (en) 2010-03-09 2010-03-09 Helical compression spring for an oil scraper ring of a piston in an internal combustion engine and method for coating a helical compression spring
PCT/EP2011/052343 WO2011110412A1 (en) 2010-03-09 2011-02-17 Helical compression spring for an oil scraper ring of a piston in an internal combustion engine and method for coating a helical compression spring

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EP2545201A1 EP2545201A1 (en) 2013-01-16
EP2545201B1 true EP2545201B1 (en) 2014-05-21

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US (1) US9004465B2 (en)
EP (1) EP2545201B1 (en)
JP (1) JP5878485B2 (en)
KR (1) KR101696617B1 (en)
CN (1) CN102933748B (en)
BR (1) BR112012022008B1 (en)
DE (1) DE102010002688C5 (en)
PT (1) PT2545201E (en)
RU (1) RU2558705C2 (en)
WO (1) WO2011110412A1 (en)

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USD937989S1 (en) * 2020-02-11 2021-12-07 Zhejiang Jike Industry & Trade Co., Ltd. Elephant faucet cover

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KR20130052546A (en) 2013-05-22
WO2011110412A1 (en) 2011-09-15
US20130168906A1 (en) 2013-07-04
PT2545201E (en) 2014-07-15
DE102010002688C5 (en) 2014-03-06
RU2012142816A (en) 2014-04-20
BR112012022008A2 (en) 2017-02-07
JP5878485B2 (en) 2016-03-08
KR101696617B1 (en) 2017-01-16
JP2013521412A (en) 2013-06-10
US9004465B2 (en) 2015-04-14
DE102010002688A1 (en) 2011-09-15
CN102933748B (en) 2016-05-11
CN102933748A (en) 2013-02-13
EP2545201A1 (en) 2013-01-16
BR112012022008B1 (en) 2019-05-28
DE102010002688B4 (en) 2012-02-16
RU2558705C2 (en) 2015-08-10

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